You do not need to worry about putting him in danger. What I meant by he knows what hes doing is more along the lines of: If there is a problem. If he is getting irritation or discomfort or anything that would cause the need for the cage to be removed, he can feel it... He knows what is going on with his body. You don't need to remove the device every X days just to "inspect". Especially if its of an open design.
Yes, sorry, PA = Prince Albert Piercing. They actually do a pretty good job of cleaning themselves. Urine is sterile when it first leaves the body. My cage is more like a tube similar to what Tom Allen wears. You just get used to keeping it clean while its on (handheld shower sprayer and then q-tips to dry everything after). Never had an issue even with wearing it for 30+ days without it being removed at all.
But, like I said, if something does become irritated, he will feel it and can ask for the key when needed. So, you should never have to worry about if you are causing any harm.